Under OX X, Bluetoosh is pretty much a no-brainer and you can get away with most any adapter. At least, that has been my experience.

The D-Link is special, IIRC, because it was the "official" Apple adapter and could be made to work under Mac OS 9. As I understand it, you pair the kb and mouse with the adapter under OS X. Next you run a firmware update for the D-Link with turns it into a generic composite USB device with two HID deivces. (see https://discussions.apple.com/thread/2218602?start=0&tstart=0)